House of Biron1737-40 and 1763-1795

Ernst Johann von Biron (1690-1772), Duke of Courland and Semigallia (1737–40 and 1763–69) and regent of the Russian Empire (1740).

Peter von Biron ( 1724- 1800), the last Duke of Courland and Zemgale from 1769 to 1795. Duke of Zagan from 1786. Knight of the Order of St. Andrew.

Ernst Johann von Biron (1690-1772)

Ludwig Ernst von Braunschweig-Lüneburg-Bevern, (1718-1788), Field-marshal of the Holy Roman Empire and the Republic of the Seven Netherlands. Duke of Courland and Semigallia in 1741. Knight of the Order of St. Andrew.